Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D271/00—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
  • C07D271/02—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
  • C07D271/06—1,2,4-Oxadiazoles; Hydrogenated 1,2,4-oxadiazoles
  • C07D271/07—1,2,4-Oxadiazoles; Hydrogenated 1,2,4-oxadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C259/00—Compounds containing carboxyl groups, an oxygen atom of a carboxyl group being replaced by a nitrogen atom, this nitrogen atom being further bound to an oxygen atom and not being part of nitro or nitroso groups
  • C07C259/12—Compounds containing carboxyl groups, an oxygen atom of a carboxyl group being replaced by a nitrogen atom, this nitrogen atom being further bound to an oxygen atom and not being part of nitro or nitroso groups with replacement of the other oxygen atom of the carboxyl group by nitrogen atoms, e.g. N-hydroxyamidines
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
  • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
  • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D307/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
  • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
  • C07D333/06—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring carbon atoms
  • C07D333/24—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
  • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
  • C07D333/26—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D333/38—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D501/00—Heterocyclic compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula:, e.g. cephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
  • C07D501/14—Compounds having a nitrogen atom directly attached in position 7
  • C07D501/16—Compounds having a nitrogen atom directly attached in position 7 with a double bond between positions 2 and 3
  • C07D501/20—7-Acylaminocephalosporanic or substituted 7-acylaminocephalosporanic acids in which the acyl radicals are derived from carboxylic acids

Definitions

• ABSTRACT 7-[N-(substituted-imidoyl)aminoacetamidolcephalosporanic acids and their salts and the corresponding betaines and desacetoxy derivatives are valuable as antibacterial agents, nutritional supplements in animal feeds, therapeutic agents in poultry and animals, including man, and are especially useful in the treatment of infectious diseases caused by Gram-positive and Gram-negative bacteria.
• 7-[N-(Phenylacetimidoyl)aminoacetamido]cephalosporanic acid is prepared for example, by Raney nickel hydrogenation (50 p.s.i., R.T.) of an aqueous solution of sodium 7-(3-benzyll ,2,4-oxadiazole-5-one-4-acetamido)cephalosporanate which is prepared in turn by reaction of 7-aminocephalosporanic acid with 3-benzyl-1,2,4-oxadiazole- 5-one-4-acetyl chloride.
• cephalosporins of the present invention possess the usual attributes of such compounds'and are particularly useful in the treatment of bacterial infections.
• Cephalothin and cephaloridine are well-known antibacterial agents; see U. S. Pat. Nos. 3,218,318; 3,449,338 and 3,498,979.
• the literature also contains considerable data on the activity of cephaloglycin and cephalexin; see U. S. Pat. Nos. 3,303,193 and 3,507,861 and Great England Pat. Nos. 985,747 and 1,054,806.
• Newer cephalosporins include cefazolin and cephapirin; see U. S. Pat. No. 3,516,997 [and also Netherlands Pat. No. 68/05179 (Farmdoc 34,328) and South Africa Pat. No. 68/4513] and U. S. Pat. No. 3,422,100.
• cephalosporins used an intermediates in the present invention
• numerous methylcephalosporins ie., 7:acetamidocephalosporanic acids, having attached at the alpha position a heterocyclic ring containing two or three or four hetero-atoms and often other substituents on the heterocyclic nucleus are reported in the literature, e.g., in U. S. Patents classified in sub-class 260-243 as exemplified most recently by U. S. Pat. Nos. 3,499,893; 3,468,874; 3,459,746; 3,464,999; 3,365,449; 3,360,515 and 3,351,597.
• 3,489,750 and 3,489,751 disclose ring-substituted cephaloglycins.
• penicillins having the same side-chains as the cephalosporins of the present invention are the subject of my U. S. application Ser. No. 50,997 filed June 29, 1970.
• n is zero or one and R, R and R each is hydrogen, nitro, di(lower)alkylamino, (lower)alkanoylamino, (lower)alkanoyloxy, (lower)alkyl (comprising straight and branched chain saturated aliphatic groups having from one to six carbon atoms inclusive), amino, hydroxy, (lower)alkylthio, (lower)alkoxy, sulfamyl,chloro, iodo, bromo, fluoro or trifluoromethyl.
• nontoxic, pharmaceutically acceptable cations include metallic cations such as sodium, potassium, calcium, aluminum, and the like, the ammonium cation and substituted ammonium cations, e.g., cations of such nontoxic amines as tri(lower)alkylamines, i.e., triethylamine, etc., procaine, dibenzylamine, N-benzyl-betaphenethylamine, l-ephenamine, N,N'-
• Such salts are preferably made by treatment of the free acid (zwitterion in the compounds of formula 1) form of the product with a strong base.
• the compounds of formula 1 form acid addition salts including the mineral acid addition salts such as the hydrochloride, hydrobromide, hydroiodide, sulfate, sulfamate and phosphate and the organic acid addition salts such as the maleate, fumarate, malate, mandelate, ascorbate, para-toluenesulfonate, B-naphthalenesulfonate, and the like.
• mineral acid addition salts such as the hydrochloride, hydrobromide, hydroiodide, sulfate, sulfamate and phosphate
• organic acid addition salts such as the maleate, fumarate, malate, mandelate, ascorbate, para-toluenesulfonate, B-naphthalenesulfonate, and the like.
• the compounds exist in the zwitterion form and Z is phenyl, benzyl, thenyl, thienyl, furyl or (lower)alkyl and preferably benzyl, 2-thenyl or 3-thenyl.
• the compounds of Formula ll above are converted into those of Formula I by hydrogenation and preferably by hydrogenation at about room temperature over Raney nickel catalyst of an aqueous solution of a salt or betaine of the compound of Formula II and preferably a sodium or potassium salt.
• the hydrogen pressure is preferably about 50 psi. or higher.
• the betaines of Formula II are produced by reacting the compounds above in which A is acetoxy with pyridine, picoline or lutidine by the method of Spencer et al., J. Org. Chem., 32, 500 (1967).
• the 3-[2-(5-methy1- 1 ,3,4-thiadiazolyl)thiomethyl] compounds are produced by reacting a compound above in which A is acetoxy with half its weight of 5- methyl-2-mercapto-1,3,4-thiadiazole, preferably in an aqueous system, e.g., in phosphate buffer at pH 6.4 for a few hours at 60 C.
• the desired product precipitates as an oil or a solid.
• the compounds of Formula II above can be prepared by direct acylation of 7-aminocephalosporanic acid or.
• the compounds of the present invention as defined above under Summary of the Invention are particularly useful in that they possess potent antibacterial activity against both Gram-positive and Gram-negative bacteria, and most particularly those having structure 1 exhibit very potent activity in vitro against enteric organisms which are resistant to the commercially available cephalosporins.
• the compounds of the present invention containing the a-(3-substituted-1 ,2,4-oxadiazole-5-one-4-yl) group are primarily useful as intermediates for the preparation of the corresponding compounds containing the 7- N-(substituted-imidoyl)aminomethyl side chain. The latter are far more potent antibacterial agents.
• the compounds of this invention containing the latter side chain are administered topically, orally and especially parenterally in accordance with conventional procedures for antibiotic administration in an amount of from about 5 to mg./kg./day and preferably in the range of 15 to 50 mg./kg./day in divided dosages, e.g., three or four times a day. They are administered in dosage units containing, for example, 125, 250, 500, 1,000 and 2,000 mg. of active ingredient with suitable physiologically acceptable carriers or excipients.
• the dosage units can be in the form of liquid preparations such as solutions, dispersions, emulsions or in solid form such as tablets, capsules, etc.
• the compounds of the present invention are also useful for decontamination of filling machines and containers used for cosmetics and topical drugs to prevent or at least reduce the very common contamination of such products with Gram-negative microorganisms.
• use is made of an aqueous solution having a concentration of at least 1 mgm./ml. and a contact time of at least 1 hour.
• Aromatic and aliphatic nitriles are well-known compounds which are prepared, for example, by the methods outlined in classic textbooks such as Organic Preparations by Conrad Weygand, lnterscience Publishers, Inc., New York (1945) on pages 115, 255 and 367 and The Chemistry of the Carbon Compounds by Victor Van Richter edited by Richard Anschutz,
• Such amides are prepared by published methods as illustrated in the following table in which it is to be understood that acids are converted to acid chlorides by treatment with thionyl chloride and acid chlorides are converted to amides by reaction with ammonia;
• Ethyl chloroformate 130.2 g., 1.2 mole was added gradually to a heated and stirred solution of 170.9 g. (1.2 mole) of 2-thiophenecarboxamide oxime, 96.5 ml. of pyridine and 300 ml. of benzene. An exothermic reaction took place which caused the mixture to reflux. The mixture was refluxed for 15 minutes after the addition of ethyl chloroformate was complete. The mixture was cooled slightly and 600 ml. of water was added. The benzene was distilled off and the remaining aqueous mixture was refluxed for 2.5 hours. After cooling overnight the product was filtered and washed with water.
• the product was dissolved in dilute aqueous sodium hydroxide solution, carbon treated, the solution acidified with acetic acid with ice cooling and the reprecipitated product filtered and washed carefully with ice water.
• the product was again purified in the same manner giving after drying in vacuo over phosphorus pentoxide 50.1 g. of 3-(2'-furyl)-5-hydroxy-1,2,4-oxadiazole; dec. above 210.
• Skellysolve B is a petroleum ether fraction of b.p. 60 68 C. consisting essentially of n-hexane.
• Ethyl chloroformate (96 ml., 1 mole) was added gradually from a dropping funnel to the above prepared solution of phenylacetamide oxime in benzene plus 80.5 ml. 1 mole) of pyridine initially at room temperature. The exothermic reaction caused the mixture to reflux. The mixture was refluxed for 15 minutes longer, cooled somewhat and 500 ml. of water added. The benzene was distilled off and the remaining aqueous mixture was heated at reflux for 2.5 hours longer. The oil which separated was extracted into benzene. The benzene phase was extracted with 175 m1. of 20 percent sodium hydroxide solution and then with 50 ml. of water. The combined basic extracts were acidified with acetic acid giving oily crystals.
• the crude product was recrystallized from benzene; m.p. 8094, yield 41 g.
• the product was combined with 100 ml. of water and 50 ml. of 20 percent sodium hydroxide solution and the mixture heated for 1 hour on the steam bath.
• the cooled solution was acidified with acetic acid.
• An additional 100 ml. of water was added to make the mixture more fluid.
• the product was collected by filtration.
• the damp filter cake was dissolved in about 500 ml. of chloroform with warming.
• the solution was dried with sodium sulfate, filtered, and the solvent distilled off at reduced pressure.
• the residue was extracted with three 250 ml. portions of boiling cyclohexane and with 500 ml.
• the product was filtered, washed on the filter with water and benzene and air dried.
• the crude product was recrystallized from toluene with a carbon treatment giving 15.9 g. of white crystalline product after drying in vacuo over phosphorus pentoxide; m.p. 111-1l3.
• the infrared and nuclear magnetic resonance spectra were consistent for the desired product.
• the aqueous phase was layered with ethyl acetate and acidified with 42 percent phosphoric acid. Insoluble material was removed by filtration prior to separation of the phases. The aqueous phase was extracted twice more with ethyl acetate. The combined ethyl acetate extracts were washed three times with water, dried with sodium sulfate, filtered and treated with 7.6 ml. (0.02 mole) of sodium 2-ethylhexanoate in l-butanol.
• the filtrate was adjusted to pH 3 with 6 N hydrochloric acid and then to pH 4.2 with 20 percent aqueous sodium hydroxide.
• the solution was concentrated to a small volume. A small amount of solid was removed by filtration.
• the filtrate was concentrated to dryness. Ethyl acetate was added to the residue and then distilled off to remove the last traces of water. The ethyl acetate treatment was repeated once; yield 3.2 g.
• the infrared and nuclear magnetic resonance spectra were consistent for the desired product.
• Solid A was recrystallized from 1:1 percent ethanol water with a carbon treatment giving 7.8 g. of 5-hydroxy-3-phenyl-l,2,4-oxadiazole as the first crop.
• the filtrate deposited a second crop (8.9 g.) (solid C) which had an infrared spectrum consistent for 3-phenyl-1,2,4-oxadiazole-5-one-4-acetic acid.
• Solid C was recrystallized by dissolving in ethyl acetate and diluting with a large volume of Skellysolve B. The material which immediately separated (solid D) was removed.
• the filtrate was stored in the cold to allow the product to crystallize; yield 3.8 g.
• the infrared and nuclear magnetic resonance spectra were fully consistent for 3- phenyl-l ,2,4-oxadiazole-5-one-4-acetic acid.
• Solid D was purified with ethyl acetate-Skellysolve B as described giving additional product.
• the filtrate from solid C was concentrated to dryness and the residue purified with ethyl acetate-Skellysolve B.
• an additional 2.8 g. of 3-phenyl-1,2,4-oxadiazole- 5-one-4-acetic acid was obtained.
• 3-Phenyll ,2,4-oxadiazole-5-one-4-acetyl chloride A suspension of 1.0 g. (0.00455 mole) of 3-phenyl- 1,2,4-oxadiazole--one-4-acetic acid in 50 ml. of methylene chloride was gassed briefly with hydrogen chloride and 1.1 g. (0.00528 mole) of phosphorus pentachloride added. The mixture was stored at room temperature for 2 hours. The solvent was distilled from the resulting clear solution leaving the acid chloride as an oil.
• the aqueous phase was layered with ethyl acetate and acidified with 42 percent phosphoric acid. Two more extractions with ethyl acetate were made. The combined ethyl acetate extracts were washed three times with water, dried with sodium sulfate, filtered and treated with 1.7 ml. (0.00455 mole) of potassium 2- ethylhexanoate in l-butanol giving an oil which slowly crystallized. The mixture was concentrated slightly and fresh ethyl acetate added.
• the crystalline product was filtered, washed with ethyl acetate, dried in vacuo over phosphorus pentoxide and further dried in vacuo at 60 for 3 hours; yield 1.58 g., decomposes l45150 with prior darkening above about 135.
• the infrared and 1 nuclear magnetic resonance spectra were consistent for the desired product.
• the filtrate was adjusted to pH 5 with 6 N hydrochloric acid, concentrated to a small volume, readjusted to pH 5, and concentrated to dryness.
• the residue was triturated with anhydrous ether and acetone, filtered, and dried in vacuo over phosphorus pentoxide; yield 0.8 g., decomposes 140-145 with prior darkening above about 130.
• the infrared and nuclear magnetic resonance spectra were consistent for the desired product.
• Example 3 3-(p-Chlorobenzyl)-l ,2,4-oxadiazole-5-one
• a solution of 151.6 g. (1 mole) of p-chlorophenylacetonitrile in 200 ml. of 95 percent ethanol was added to a stirred mixture of 69.5 g. (1 mole) of hydroxylamine hydrochloride, 53 g. (0.5 mole) of sodium carbonate, 200 ml. of water and 400 ml. of 95 percent ethanol.
• the mixture was heated at reflux for 19 hours. Most of the ethanol was stripped off at reduced pressure causing the crude p-chloroph enylacetamide oxime to separate as an oil.
• the product was extracted into 600 ml. of benzene.
• the benzene extract was washed two times with water.
• the product which started to crystallize from the benzene phase was kept in solution by warming.
• the benzene solution was concentrated to about 400 ml.
• Ethyl chloroformate (108.5 g., 1 mole) was added dropwise to a stirred mixture of the above prepared solution of p-chlorophenylacetamide oxime in benzene plus 80.5 ml. (1 mole) of pyridine.
• the reaction mixture was brought to reflux after about three-quarters of the ethyl chloroformate had been added.
• the mixture was refluxed for 25 minutes after the addition was completed.
• the mixture was cooled to room temperature and 500 ml. of water were added.
• the benzene was distilled off.
• the aqueous residue was heated at reflux for 2 hours.
• the reaction mixture was cooled in an ice bath and the aqueous phase decanted from the oil.
• the filtrate was added to a freshly prepared solution of sodium methoxide in methanol made by adding 2.5 g. (0.1 1 mole) of sodium to m1. of methanol. Ethyl bromoacetate (18.4 g., 0.11 mole) was added. The stirred mixture was refluxed for 19 hours in an apparatus protected from atmospheric moisture. The solvent was distilled off at reduced pressure. To the residue was added 200 ml. of glacial acetic acid and 100 ml. of 6 N hydrochloric acid and the mixture heated at reflux for 2 hours. The volatile materials were stripped off at reduced pressure. Water and benzene were added to the residue causing the product to crystallize.
• the product was filtered, washed with water and benzene and twice recrystallized from toluene with a carbon treatment each time; yield 8.9 g., m.p. 149.
• the infrared and nuclear magnetic resonance spectra were fully consistent for the desired product.
• a solution of the acid chloride in 90 ml. of acetone was added in one portion to a rapidly stirred mixture of 4.07 g. of 7-arninocephalosporanic acid, 5.02 g. of sodium bicarbonate, 150 ml. of water and 60 ml. of acetone at room temperature. After stirring for minutes the mixture was extracted three times with ethyl acetate. The aqueous phase was layered with ethyl acetate and acidified with 42 percent phosphoric acid. Two more extractions were made on the aqueous phase with ethyl acetate. The solid which had separated on acidification was removed by filtration during the second extraction.
• Ethyl chloroformate (190 ml., 2 moles) was added in a slow stream to a stirred and cooled (25-30) solution of the above obtained chloroform solution of phenylacetamide oxime, an additional 1.5 l of chloroform and 280 ml. (2 moles) of triethyl amine.
• the solution was concentrated at reduced pressure (in 3 batches) until a thick residue of product and triethylamine hydrochloride remained. The batches were combined and extracted 3 times with water. The chloroformproduct phase was stripped at reduced pressure to remove the remainder of the solvent. To the residue was added a solution of 120 g. of sodium hydroxide in l l. of water.
• the vigorously stirred mixture was heated rapidly during about 10 minutes to 80 causing most of the material to go into solution.
• the cooled (25) mixture was extracted once with 300 ml. of benzene to remove a small amount of insoluble oil.
• the ice cooled aqueous phase was acidified (pH 2-3 with concentrated hydrochloric acid.
• the product was collected by filtration, washed with water and air dried; yield 153.1 g.
• the product was suspended in 800 ml. of water and aqueous sodium hydroxide solution (69 g. of sodium hydroxide in 200 ml. of water) added in slight excess of the amount needed to dissolve all of the solid.
• the solution was carbon treated, filtered and acidified with concentrated hydrochloric acid.
• the aqueous phase together with the precipitate which had formed was layered with ethyl acetate and acidified with 42 percent phosphoric acid.
• Three extractions using a total of ca. 800 ml. of ethyl acetate were made.
• the combined ethyl acetate extracts were washed 3 times with water, dried with sodium sulfate, filtered and treated with 8.1 ml. (0.0214 mole) of sodium 2-ethylhexanoate in l-butanol giving a precipitate.
• To this mixture was added 7 ml. of water resulting in a crystalline solid. The mixture was concentrated to about 500 ml.
• EXAMPLE 5 A suspension of 4.16 g. of 7-(3-benzyl-l,2,4-oxadiazole-5-one-4-acetamido)desacetoxycephalosporanic acid in 150 ml. of water was adjusted to pH 7 with solid sodium bicarbonate causingmost of the material to dissolve. Dioxane (50 ml.) was added and the slightly turbid solution was hydrogenated in the presence of commercial Raneey nickel catalyst (No. 28) on a Parr hydrogenation apparatus at room temperature at an initial pressure of 50 p.s.i. for 1 hour. The catalyst was removed by filtration.
• the filtrate was adjusted to pH 4.3 with 6 N hydrochloric acid, concentrated to about one half of its initial volume, again adjusted to pH 4.3, and further concentrated to a small volume causing the product to precipitate.
• the product was filtered, washed with water and acetone, dried in vacuo over phosphorus pentoxide and further dried in a vacuum oven at 60 for 4 hours; yield 1.96 g., decomposes l84 l86 with prior darkening above about The infrared and nuclear magnetic resonance spectra were consistent for the desired compound.
• EXAMPLE 7 7-[N-(Phenylacetimidoyl)aminoacetamido ]cephalosporanic acid
• 3-benzyl-l,2,4-oxadiazole-5-one-4- acetyl chloride prepared from 5.0 g., 0.0214 mole of the acid
• acetone was added in one portion to a rapidly stirred mixture of 5.72 g. (0.0214 mole) of 7-aminocephalosporanic acid, 7.2 g. (0.0856 mole) of sodium bicarbonate, 150 ml. of water and 60 ml. of acetone at room temperature.
• a suspension of 4.2 g. of 7-(3-benzyl-l,2,4-oxadiazole-5-one-4-acetamido)cephalosporanic acid, 0.2 g. of solid B and 0.2 g. of solid D in 200 ml. of water was brought into solution by addition of solid sodium bicarbonate to pH 6.5.
• the solution was hydrogenated in the presence of commercial Raney nickel catalyst (No. 28) on a Parr hydrogenation apparatus at an initial pressure of 50 psi. at room temperature for 2 hours. During this time the theoretical amount of hydrogen was taken up.
• the catalyst was removed by filtration. The filtrate was adjusted to pH 4.5 with 6 N hydrochloric acid and concentrated to dryness.
• EXAMPLE 10 7-[N-(Benzimidoyl)aminoacetamido]desacetoxycephalosporanic acid
• a solution of 2.1 g. of potassium 7-(3-phenyl-l,2,4- oxadiazole-S-one-4-acetamido)desacetoxycephalosporanate in 200 ml. of water was hydrogenated in the presence of commercial Raney nickel catalyst on a Parr hydrogenation apparatus at room temperature at an initial pressure of 50 p.s.i. for 2 hours. The catalyst was removed by filtration. The filtrate was adjusted to pH 4.8 with 6 N hydrochloric acid and concentrated to dryness at reduced pressure.
• the residue was triturated with anhydrous ether producing a filterable solid; yield 1.6 g.
• the material was crystallized by dissolving in water and then adding acetone to the cloud point; yield after drying in vacuo over phosphorus pentoxide, 0.39 g., decomposes 183-187.
• the infrared and nuclear magnetic resonance spectra were consistent for the desired product.
• EXAMPLE 11 7-( 3-Benzyl-l ,2,4-oxadiazole-5-one-4-acetamido)-3- (1-pyridylmethyl)-3-cepheme-4-carboxylic acid betaine
• a mixture of 8 g. of 7-(3-benzyl-l,2,4-oxadiazole-5- one-4-acetamido)cephalosporanic acid, 32 g. of potassium thiocyanate, 8 ml. of water and 4 ml. of pyridine was heated at 60-65 for 5 hours. To the reaction mixture which had been stored at room temperature overnight was added ml. of water. The resulting solution was slowly acidified to pH 2 with 6 N hydrochloric acid with ice cooling.
• the aqueous phase was decanted from the gummy precipitate.
• the precipitate was triturated three times with water and the resulting solid, 7- (3-benzyl- 1 ,2,4-oxadiazole-5-one-4-acetamido)-3-( lpyridylmethyl)-3-cepheme-4-carboxylic acid thiocyanate was collected by filtration.
• the solid was suspended in ml. of water plus 40 ml. of a 25 percent solution of Amberlite LA-l resin acetate form in toluene [Spencer et al., J. Med. Chem. 9, 746 (1966), footnote l4] and the mixture stirred for 1 hour.
• the toluene-resin phase was separated and 40 ml. of a 25 percent solution of Amberlite LA-l resin acetate form in methyl isobutyl ketone was added and the mixture stirred for 1 hour. The resulting emulsion was extracted six times with anhydrous ether. The aqueous phase was filtered and stored in the refrigerator overnight. The water was stripped off at reduced pressure. Ethyl acetate was added to the residue and this stripped out to remove any remaining water. The ethyl acetate treatment was repeated once. The solid was triturated with anhydrous ether and filtered giving 2.2 g.
• Amberlite LA-l resin is a mixture of secondary amines wherein each secondary amine has the formula wherein each of R, R and R is an aliphatic hydrocarbon radical and wherein R, R and R contain in the aggregate from 11 to 14 carbon atoms; this particular mixture of secondary amines, which is sometimes referred to as Liquid Amine Mixture No. I, is a clear amber liquid having the following physical characteristics: viscosity at 25 C. of 70 cps.; specific gravity at 20 C. of 0.845; refractive index at 25 C. of 1.467; distillation range at 10 mm.: up to C. 74%, above 220 C. 17%.
• EXAMPLE 12 7-[N-(Phenylacetimidoyl)aminoacetamido]-3-( lpyridylmethyl)-3-cepheme-4-carboxylic acid chloride hydrochloride
• the oil was extracted into 600 ml. of chloroform.
• the chloroform extract was washed three times with water, dried over sodium sulfate and concentrated to a volume of about 500 ml.
• Ethyl chloroformate (114.4 ml.) was added from a dropping funnel to a solution of the above obtained 2- thiopheneacetamide oxime in chloroform plus on additional 500 ml. of chloroform and 168 ml. of triethylamine with cooling to keep the temperature from rising above 25.
• the solvent was distilled off at reduced pressure.
• the residue was extracted with water to remove triethylamine hydrochloride.
• the organic phase was further stripped at reduced pressure to remove all solvent leaving an oil as residue.
• To the residue was added a solution of 72 g. of sodium hydroxide in 600 ml. of water and the mixture heated to 75 during minutes.
• the solution was cooled to room temperature and twice extracted with benzene.
• the aqueous phase was carbon treated and acidified with cooling to pH 3.5 causing the product to crystallize.
• the product was filtered, washed with water and air dried; yield 108.9 g.
• the product was purified by dissolving in aqueous sodium hydroxide (24 g. of sodium hydroxide in 500 ml. of water), carbon treating the solution and acidifying with concentrated hydrochloric acid. There was obtained 84.3 g. of 3-(2-thenyl)-l,2,4- oxadiazole-S-one, m.p. 96-97.5.
• the concentrate was extracted twice with ethyl acetate.
• the combined ethyl acetate extracts were washed with water, dried over sodium sulfate, filtered and the filtrate treated with 31 ml. (0.081 mole) of sodium 2-ethylhexanoate in l-butanol causing sodium 3-( 2-thenyl)- 1 ,2,4-oxadiazole-5-one-4-acetate to crystallize.
• the product was filtered and washed well with ethyl acetate; yield 7.0 g.
• the infrared spectrum was consistent for the desired product. Acidification of an aqueous solution of the sodium salt produced the crystalline free acid, 3-(2-thenyl)-1,2,4-oxadiazole-5- one-4-acetic acid.
• the sodium salt is prepared by treating an ethyl acetate solution of the free acid with an equivalent amount of sodium 2-ethylhexanoate in l-butanol.
• EXAMPLE l7 3-(3-Thenyl)-1,2,4-oxadiazole-5-one
• a mixture of 155.6 g. of 3-thiopheneacetonitrile, 105.08 g. of hydroxylamine hydrochloride, 80.12 g. of sodium carbonate, 600 ml. of methanol and 360 ml. of water was heated at 50 for 18 hours.
• the methanol was stripped off at reduced pressure.
• the product, 3- thiopheneacetamide oxime separated as an oil.
• the oil was extracted into 600 ml. of chloroform.
• the chloroform extract was washed three times with water and dried over sodium sulfate causing the oxime to crystallize.
• the product was removed from the sulfate by dissolving it with 600 ml. of tetrahydrofuran and filtering off the sodium sulfate. The solvent was removed from the filtrate at reduced pressure. The crystalline residue was dissolved in 1000 ml. of chloroform containing 176.4 ml. of triethylamine.
• Ethyl chloroformate (120.1 ml.) was added from a dropping funnel to the above obtained solution of 3- thiopheneacetamide oxime with cooling to keep the temperature from rising above 25.
• the solvent was distilled off at reduced pressure.
• the residue was extracted with water to remove triethylamine hydrochloride.
• the organic phase was further stripped at reduced pressure to remove all solvent leaving an oil as residue.
• To the residue was added a solution of 75.6 g. of sodium hydroxide in 600 ml. of water and the mixture heated to during 15 minutes. The solution was cooled to room temperature and twice extracted with benzene.
• the aqueous phase was carbon treated and acidified with cooling to pH 3.5 causing the product to crystallize.
• the product was collected by filtration, washed with water and air dried.
• the product was purified by recrystallization from benzene; yield 51.0 g.
• the product was further purified by dissolving in aqueous sodium hydroxide l 1.24 g. of sodium hydroxide in 300 ml. of water) and acidifying with concentrated hydrochloric acid. There was obtained 47.5 g. of 3-(3- thenyl)- l ,2,4-oxadiazole--one, m.p. 6364.5.
• the solution was carbon treated, cooled and acidified with concentrated hydrochloric acid causing the acid form of the product to separate as an oil.
• the mixture was extracted twice with ethyl acetate.
• the combined ethyl acetate extracts were washed with water, dried over sodium sulfate, filtered and the filtrate treated with 79.0 ml. (0.080 mole) of sodium 2- ethylhexanoate in l-butanol causing sodium 3-(3-thenyl)-l,2,4oxadiazole-5-one-4-acetate to crystallize.
• the product was collected by filtration and washed well with ethyl acetate; yield 13.8 g. The infrared spectrum was consistent for the desired product.
• R or its sodium or its potassium salt 2 17.
• the compound having the formula H3O R2 CH3, CHzCNI-ICH2C 0 ll H or 15 S 3 J NH-(fiH-(ffi JHZ O CN CyC-CHSiS)*CHa wherein n is O or 1 and R, R and R each is hydrogen, nitro, di(lower)alkylamino, (lower)alkanoylamino, (lower)alkanoyloxy, (lower)alkyl, amino, hydroxy, (lower)alkylthio, (lower)alkoxy, sulfamyl, chloro, or sodmm or Potassium iodo bromo fluoro or trifluoromethyL 18.
• a compound of claim 1 wherein Z is phenyl, F CH1 E benzyl, p-chlorobenzyl, 2-thenyl or 3-thenyl.
• H O CN CCH1O-CCH1 4.
• Z has the structure CH2- wherein Z is p-chlorobenzyl, phenyl, Z-thenyl or 3-the- R nyl.
• a compound of claim 4 wherein A is hydrogen. fi OH CH2 6.
• a compound of claim 4 wherein A is acetoxy. NH O CN CH3 7.
• a compound of claim 4 wherein A is 2-(5-methyll ,3,4-thiadiazolyl)thio.
• the sodium salt of the compound of claim 9. 1 12.
• the potassium salt of the compound of claim 9. 21 A compound of claim 1 having the formula 13.
• the compound having the formula H fi 0 I H 0 O---N (J-CHz-O-ll-CH; OHz-(

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• 1970
  • 1970-08-12 US US63314A patent/US3692779A/en not_active Expired - Lifetime
• 1971
  • 1971-06-29 ZA ZA714254A patent/ZA714254B/xx unknown
  • 1971-07-29 AU AU31798/71A patent/AU452904B2/en not_active Expired
  • 1971-08-06 JP JP46059083A patent/JPS5139236B1/ja active Pending
  • 1971-08-09 NL NL7110941A patent/NL7110941A/xx unknown
  • 1971-08-09 CH CH1169471A patent/CH567036A5/xx not_active IP Right Cessation
  • 1971-08-11 HU HUBI399A patent/HU162362B/hu unknown
  • 1971-08-11 FR FR7129428A patent/FR2102215B1/fr not_active Expired
  • 1971-08-11 CA CA120,281A patent/CA988925A/en not_active Expired
  • 1971-08-11 BE BE771189A patent/BE771189A/fr unknown
  • 1971-08-12 GB GB3783471A patent/GB1363456A/en not_active Expired
  • 1971-08-12 DE DE19712140498 patent/DE2140498A1/de active Pending

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